multi-line-vars.php

<?php
$my_var = 'Something

on multiple
lines';

$cleaned_var = str_replace( [ "\r", "\n", chr( 10 ), chr( 13 ) ], '', $my_var );

// comme Oleg dit, juste au cas où tu te bats contre des quotes
$cleaned_var = str_replace('"', '&quot;', $cleaned_var);


?>
	<script>
		var jsVar = "<?php echo $cleaned_var; ?>";

		console.log( jsVar );
	</script>
<?php